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Is It Normal or Melanoma? The Black Line on Your Nail
Splinter Hemorrhages
Splinter hemorrhages are thin, red or reddish-brown lines under your fingernails or toenails. They run vertically in the direction of your nail growth. They're caused by small areas of bleeding (hemorrhaging) under your nails.
Melanonychia
Melanonychia is a brown or black color in your nails. It can affect one nail, a few nails, or all of your nails. It's caused by an increase in melanin, the pigment that gives your skin its color.
Is the Black Line on Your Nail Normal?
In most cases, a thin black line on your nail is a splinter hemorrhage. Splinter hemorrhages can be caused by minor trauma to the nail, such as hitting your finger or toenail. They are usually harmless. However, it's always a good idea to see a doctor to rule out any underlying medical conditions.
When to See a Doctor
You should see a doctor if:
- The black line on your nail is wide or jagged.
- The black line on your nail is changing color or shape.
- You have other symptoms, such as pain, swelling, or bleeding around the nail.
These could be signs of a more serious condition, such as melanoma, a type of skin cancer. Melanoma can be treated if it is caught early.
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